Return-Path: X-Original-To: apmail-hadoop-hdfs-dev-archive@minotaur.apache.org Delivered-To: apmail-hadoop-hdfs-dev-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 5B929184B7 for ; Fri, 10 Jul 2015 23:56:05 +0000 (UTC) Received: (qmail 60960 invoked by uid 500); 10 Jul 2015 23:56:04 -0000 Delivered-To: apmail-hadoop-hdfs-dev-archive@hadoop.apache.org Received: (qmail 60858 invoked by uid 500); 10 Jul 2015 23:56:04 -0000 Mailing-List: contact hdfs-dev-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hdfs-dev@hadoop.apache.org Delivered-To: mailing list hdfs-dev@hadoop.apache.org Received: (qmail 60843 invoked by uid 99); 10 Jul 2015 23:56:04 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 10 Jul 2015 23:56:04 +0000 Date: Fri, 10 Jul 2015 23:56:04 +0000 (UTC) From: "Jing Zhao (JIRA)" To: hdfs-dev@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Created] (HDFS-8760) Erasure Coding: reuse BlockReader when reading the same block in pread MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 Jing Zhao created HDFS-8760: ------------------------------- Summary: Erasure Coding: reuse BlockReader when reading the same block in pread Key: HDFS-8760 URL: https://issues.apache.org/jira/browse/HDFS-8760 Project: Hadoop HDFS Issue Type: Sub-task Reporter: Jing Zhao Assignee: Jing Zhao Currently in pread, we create a new block reader for each aligned stripe even though these stripes belong to the same block. It's better to reuse them to avoid unnecessary block reader creation overhead. This can also avoid reading from the same bad DataNode. -- This message was sent by Atlassian JIRA (v6.3.4#6332)